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Questions  

The potential energy function for a diatomic molecule is U(x) = ax12bx6. In stable equilibrium , the distance between the particles is 

a
2ab16
b
ab16
c
b2a16
d
ba16

detailed solution

Correct option is A

F=−dUdx=12ax13−6bx7At equilibrium ,F=0  or x=  2ab16At this value of x , we can see that d2Udx2  is positive.So, potential energy is minimum or equilibrium is stable

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